Nami if you get a chance, totally add that Sages/Profs should bring Yellow Gems for dispel on being able to fight Magic Mirror sometime. :o
Also for fighting Wall of Fog, sages/profs need to bring blue gems with them to be able to Land Protector out the fog. It makes it possible to beat some of these monsters in some cases, especially if you place it really well and can abuse your own fogs and safetywalls. :D